Harken® MKIV Hydraulic Jib Reefing and Furling allow sails to be reefed, furled, or set with the touch of a button. Both tack and head have double swivels, improving sail shape when partially reefed. MKIV hydraulic furlers are used on cruisers and high-performance cruising yachts with headstays up to -60 rod.

J maximum (mm)109 mm

J maximum (in)4 5/16 in

J minimum (mm)91.8 mm

J minimum (in)3 5/8 in

K maximum (mm)402 mm

K maximum (in)15 13/16 in

K minimum (mm)232 mm

L (mm)61 mm

K minimum (in)9 1/8 in

L (in)2 13/32 in

M (mm)63 mm

M (in)2 5/8 in

Extrusion length (m)2.74 m

Extrusion length (ft in)9 ft in

Luff tape size (mm)5, 6 mm

Luff tape size (in)#6 (6/32), #7 (7/32) in

FootnoteHydraulic cylinder increases standard and max headstay lengths., If hydraulic cylinder is used, dimensions E through I will increase according to cylinder length and settings. See installation manual for detailed cylinder dimension info.